Balance.



PATENTED MAY 16, 1905.

P. H. WYNNB.

BALANCE.

APPLICATION FILI-:D N'0v.4;19o4.

N0. 789,781. Patented May 16, 1905.

UNITED STATES PATENT OEEICE.

PHILIP HENRY WYNNE, OF BOSTON, MASSACHUSETTS, ASSTGNOR OF ONE- HALF TO L. E. KNOTT APPARATUS COMPANY, OF BOSTON, MASSA- CHUSETTS, A CORPORATION OF MASSACHUSETTS, AND ONE-HALF TO AGNES VYNNE, OF BOSTON, MASSACHUSETTS.

BALANCE.

SPECIFICATION forming part of Letters Patent No. 789,781, dated May 16, 1905,

Application filed November 4, 1904. Serial No. 231,330.

T ZZ Uff/L07 "my @OwN/f lind that a satisfactory way of securing the Be it known that T, PI-IILII HENRY W YNNE, cords to the beam is to employ clamping a citizen of the United States, and a resident members which are carried by the beam and 50 of Boston, in the county of Suffolk and State between which the cords are clamped. One oil Massachusetts, have invented an Improvepair of clamping members is secured to the ment in Balances, of which the following debeam at its central portion and other pairs at scription, in connection with the accompanythe ends thereof. The l'leXibility of the vaing drawings, is a specification, like numerals rious cords permits the beam to tip, and by 55 on the drawings representing like parts. properly locating` these clampingsurfaces IO This invention relates to balances, and has with relation to each other and by employing for its object to provide a simple and inexa cord of the proper construction it is possipensive balance which will be extremely senble to construct a balance which is as sensisitive in operation and which is so constructed tive as the most nicely constructed knife-edge 60 that there is practically no possibility of its balance, but which is very' much less expenlosing its sensitiveness through rough hansive and which will withstand comparatively dling. Y rough handling without any danger ot' injury.

Most balances or scales as now constructed Referring to the drawings, Figure l is a are provided with knife-edges at the I'ulcrumfront view showing one form of my improved 65 points, and to insure the necessary degree of balance. Fig. 2 is a section on line a a', Fig.

2O sensitiveness it is important that the center 1. Fig. 3 is an end view of the beam. Fig'.

knife-edge about which the beam turns should A is a side View of Fig. 3. Fig. 5 is an enbein the same plane as the knife-edges at the larged section through the beam on line fr' af, end of the beam upon which the weight-sup- Fig. l. Fig. G is a side View ot Fig. 5. Fig. 70 porting devices are suspended and that each 7 is a perspective view ot' the pair of centrallyof the latter knife-edges should be exactly located clamping members. Fig. 8 is a perthe same distance from the center knife-edge. spective view of one ot' the pairs of clamping To obtain this necessary precision in the relamembers at the ends of the beam. Fig. 9 is tive position of the knife-edges entails cona vertical section through the lower end ot' 75 siderable labor and skill in manufacture, and the standard. Fig. 10 is an enlarged section as a consequence scales or balances which are on the line Fig. 2. Fig. l1 is a section at all sensitive are more or less expensive. on the line ,1/ y, Fig'. 5. Fig. l2 is a section Moreover, unless these implements are used on the line a a, Fig. 6. with eXtreme care the knife-edges are apt to 3 designates the beam of my improved bal- SO become chipped and broken, and when this ance, and it is shown as suspended from an occurs the sensitiveness ot' the implement is overhanging arm 4, carried by a suitable destroyed and it is rendered of practically no standard 5, which rises 'from a base 6 of any value. suitable or usual construction. Said beam is It is the purpose of my present invention suspended from the arm 4t by means of a cord 35 to provide a novel balance in which no kni'te- 7, and the scale-pans 3 are suspended from the 40 edges are used and which is as sensitive it' ends of the beam by other cords, 9. These not more sensitive than any knife-edge balcords may be secured to the beam in any suitance. I accomplish this object by suspendable way; but l prefer to clamp each cord being the beam centrally of its length by means tween a pair of clamping members which are 90 ot' a iieXible cord and by supporting the carried by the beam. Said clamping memweights and the articles to be weighed from bers may be made of various shapes and atthe ends of the beam by means oi' similar tached to the beam in various ways without cords, which are secured to the beam ends. I departing from my invention. I have found,

however, that the clamping members such as shown in the accompanying drawings make a very satisfactory means for thus securing the cords to the beam. ln the scales herein illustrated the cord 7, by which the beam is suspended, is clamped between two clamping members 10 and 11, which are secured to the beam at its central portion. Said clamping members are best shown in Fig. 7, and each comprises a block having a slot 12 formed therein, in which slot the beam is received. These clamping members are secured to the beam by clamping-screws 13, and the two members are clamped together for clamping the cord 7 therebetween by means of other clamping-screws, 14. At the point where the cord 7 leaves the beam I have provided two meeting edges between which thc cord is held, the line in which said edges meet constituting what I have called a fulcrum edge.7 For convenience of construction I have used the two edges of the clamping-faces as the fulcrum edge; but this construction is not essential to the invention. The clamping members of each pair at the ends of the beam are designated by 17 and 18, respectively, the member 17 preferably being in the form of a thin plate, while the member 18 is more in the nature of a block. Each member is provided on its under side with a slot 19, in which the beam is received, and the two members are clamped together,thereby to clamp the weightsuspending cord 9 therebetween by means of clampingscrews 20. rIhe member 18 is clamped to the beam by means of any suitable clamping-screw 2l. The edges 22 of the clamping members where the weight-suspending cord leaves the clamping-faces of said members coincide with each other and form a fulcrum edge about which the cord 9 iiexes as the beam tips. In order to make the balance extremely sensitive and accurate, it is important that the twofulcrum edges 22 should be in the same plane as the fulcrum edge 15, so that a right line, such as the dotted line 23, will pass through all of said edges. I will preferably make the holes in the beam through which the clamping-screws 13 and 21 pass4 slightly larger than said screws, thereby enabling the various clamping-blocks to be adjusted sufficiently on the beam to meet the above conditions. It is also necessary that both the fulcrum edges 22 should be the same distance from the fulerum edge 15. Where these conditions are met and a cord of the proper construction is used, the scales will be fully as sensitive and accurate as the most perfectly-constrncted knife-edge scales.

In the above description and in the claims I have used the term Lfulcrum edge to designate the edges or lines in which the cords leave the beam and about which edges the cords Hex as the beam turns. To simplify the construction, I employ the meeting edges of cach pair of clamping-surfaces as a fulcrum edge; but such construction is not essential to the invention. It will be noted that the fulcrum edges have a function quite distinct from that of the clampingsurfaces. lhe cord which I prefer to use is one which l'lexcs easily, but is non-resilient.

It will be noted that the cords 7 and 9 are bent to form loops, the ends of cach cord being clamped between the corresponding clamping members. For stcadying the beam `l prefer to suspend the cords 7 upon two hooks 25, as best seen in Fig. 2, although this is not essential to the invention.

I have herein illustrated the arm 4f as having integral therewith a vertical arm 26,which is slidably mounted in the standard 5, said arm 26 being' held from turning by a suitable pin or screw 27, which plays in a slot 28 in said arm. rIhe lower end of the arm rests upon a thrust-pin 29, situated within the standard 5. The lower end of the thrust-pin is forked, and between the branches of the fork thereof is received one end of a key-lever 30, the other end of which is received in a slot 3l in a'guide member 32. lhen the scales are not in use, the arm 4 is lowered snl'liciently so that the weight of the scale-pans is taken from the weight-suspending cords 9. Io raise the beam, the key end of the lever 30 is depressed and caught under a retaining-shoulder 33, the rocking movement of such lever elevating a thrust-pin 29, and consequently the arm 26, thereby lifting the beam suiiiciently to carry the scale-pans ofi'l from the plate 6.

38 designates a gage or pointer for use in determining when the beam is exactly level. Said gage is illustrated as being adjustably carried by a standard 37.

`While I have illustrated herein one simple embodiment of my invention, I do not wish to be limited to the construction shown, as it will be obvious that the principle underlying the invention maybe embodied in balances constructed differently from that herein illustrated.

Hav/*ing fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In balances, a beam having between its ends a pair of opposed clamping-surfaces and two alined edges, a pair of clamping-surfaces and two alined edges either side of said lirstnamed clamping-surfaces, a cord by which the beam is suspended,said cord being' clamped between the iirst-mentioned pair of clamping- IOO IIO

surfaces and passing between the correspondpair of opposed clamping-surfaces and a fulerum edge, a non-resilient Cord clamped between the Erst-named Clamping-surfaces and by which the beam is suspended, and a nonresilient weight-supporting cord secured between the clamping-surfaces adjacent eaeh end of the beam, all the cords flexing over the fulerum edges as the beam oseillates.

3. In a balance, a beam having centrally thereof and at eaeh end a pair of opposed clamping-surfaces, the central pair of clamping-surfaces terminating at their upper side in a fulernm edge, and the Clamping members of eaeh pair at the end of the beam terminating at their lower sides in a fulerum edge, a oord secured between the centrally-located clamping-surfaces and by which the beam is suspended, and a weight-supporting oord seeured between eaeh of the pairs of clampingsurt'aees at the ends of said beam.

4. In a balance, a beam having centrally thereoi` and at each end a pair of opposed clamping-surfaces, the Central pair of clamping-surfaces terminating' at their upper side in a fuleruin edge, and the clamping-surfaces of eaeh pair at the ends of the beam terminating at their lower sides in a fuleruni edge, a oord secured between the centrally-located Clamping-surfaces and by which the beam is suspended, and a weight-supporting oord secured between each of the pairs of clampingsurfaees at the' ends of said beam, said fulernm edges all being in the same plane.

In testimony whereof I have signed my name to this speeilieation in the presence of two subscribing witnesses.

PHILIP HENRY IVYNNE. 

